Pulmonary veins carry oxygenated blood from lungs to heart, while pulmonary arteries carry deoxygenated/CO2 rich blood from heart to lungs. On the other hand, systemic arteries carry oxygen-rich blood from the heart to other parts of the body and likewise systemic veins carry CO2-rich blood from all the parts of body back to the heart and lungs. This makes sense to me, since oxygen and CO2 are used and generated in metabolic processes, respectively, and need to be transported to and from the lungs/systemic tissues continuously.

However, what I do not quite understand is what blood vessel carry absorbed nutrients from the intestine to other parts of body? Also, what blood vessels carry other metabolic wastes from the peripheral cells to the kidney for excretion?

Any reference/link to basic working of blood circulation would be helpful.


closed as off-topic by anongoodnurse, kmm, March Ho, MattDMo, rg255 Jun 26 '16 at 15:56

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  • 2
    $\begingroup$ If you do a bit of research into "mesenteric circulation" (choose one with the stomach) and "renal circulation" on Google images, it should give you all the information you need. $\endgroup$ – anongoodnurse Jun 25 '16 at 19:00
  • $\begingroup$ Your first sentence is incorrect. Please edit your post and clarify. $\endgroup$ – MattDMo Jun 25 '16 at 23:25
  • $\begingroup$ This question always intrigued me, but i didn't think about it much. Time to study, and learn :D $\endgroup$ – ABcDexter Jun 26 '16 at 5:06